Patents Represented by Law Firm Depaoli & O'Brien
  • Process for dispersing silicon carbide whiskers
    Patent number: 4956316
    Abstract: Silicon carbide whiskers such as those used in reinforcing ceramic composites are deagglomerated by dispersing the whiskers in an aqueous silane dispersant comprising a silane containing nonreactive hydrocarbon groups and reactive hydrolyzable groups, a cationic lubricant and an acid to provide a dispersant pH of about 3.5 to about 6.0. The whiskers can be deagglomerated prior to mixing with the ceramic powder used to form the composite or the whiskers, ceramic powder and aqueous silane dispersant can be mixed simultaneously. Dispersal permits classification and selection of specific aspect ratio distributions for the ceramic composite. Deagglomeration permits use of higher vol. % SiC whiskers while still attaining greater than 99% density.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: September 11, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Linda C. Sawyer
  • Side chain liquid crystalline polymers exhibiting nonlinear optical response
    Patent number: 4954288
    Abstract: This invention provides novel side chain liquid crystalline polymers. An invention polymer exhibits nonlinear optical response, and has utility as a transparent nonlinear optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: November 14, 1989
    Date of Patent: September 4, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Anthony J. East
  • Side chain liquid crystalline polymers exhibiting nonlinear optical properties
    Patent number: 4948532
    Abstract: This invention provides novel sidechain liquid crystalline polymers which exhibit nonlinear response, and which have utility as a transparent nonlinear optical component in optical light switch and light modulator devices.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: August 14, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. DeMartino, Hyun-Nam Yoon, James B. Stamatoff
  • Boron ceramics from carboralated diacetylene polymers
    Patent number: 4946919
    Abstract: Boron-containing ceramics are formed from organoboron preceramic polymers which are carboralated acetylenic polymers. The polymers can be formed by carboralating acetylenic or diacetylenic diols and condensing the diols to form carboralated polyesters. In an alternative process, polydiacetylene formed by the polymerization of diacetylene monomers having conjugated triple bonds are carboralated subsequent to polymerization. A process for obtaining readily soluble polydiacetylenes comprises heating a diacetylene diol in a high boiling solvent.
    Type: Grant
    Filed: November 18, 1988
    Date of Patent: August 7, 1990
    Assignee: Hoechst Celanese Corp.
    Inventor: Robert E. Johnson
  • Side chain liquid crystalline polymers exhibiting nonlinear optical response
    Patent number: 4944896
    Abstract: This invention provides novel side chain liquid crystalline polymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in electrooptic light modulator devices.
    Type: Grant
    Filed: July 13, 1988
    Date of Patent: July 31, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. DeMartino, Hyun-Nam Yoon, James B. Stamatoff, Alan Buckley
  • Process for producing liquid crystalline composites
    Patent number: 4944895
    Abstract: This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline component.In one embodiment this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline compound.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: July 31, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Alan Buckley, Tessie M. Che, Thomas M. Leslie, James B. Stamatoff, Dagobert E. Stuetz, Donald R. Ulrich
  • Easily poled 0-3 piezoelectric composites for transducer applications
    Patent number: 4944891
    Abstract: A PZT-polymer composite of 0-3 connectivity further includes a third phase particulate additive of conductive or semiconductive material to increase the electrical conductivity of the polymer matrix.
    Type: Grant
    Filed: March 6, 1987
    Date of Patent: July 31, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Geon Sagong, Robert E. Newnham, Ahmad Safari, Sei-Joo Jang
  • Polyacetal lighter body resin
    Patent number: 4942208
    Abstract: A novel polyacetal resin blend provides for dimensionally stable rib-reinforced tubular bodies upon injection molding of the blend. The blend comprises a major proportion of an oxymethylene copolymer having a melt index of 27.0 grams/10 minutes and a minor proportion of an oxymethylene copolymer having a melt index of 9.0 grams/10 minutes to provide hydrolytic stability to the molded article. Each of the oxymethylene copolymers are formed from recurring oxymethylene units interspersed with alkylene oxide units in which the alkylene group contains at least two adjacent carbon atoms. The blend is particularly useful in forming cigarette lighter bodies.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: July 17, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Alex S. Forschirm, Jon H. Davies
  • 5H-pyrazolo[4,3-A] quinolizin-5-one compounds exhibiting therapeutic activities
    Patent number: 4940715
    Abstract: This invention provides novel 5H-pyrazolo[4,3-a]-quinolizin-5-one compounds which exhibit a selective inhibitory activity against IgE-antibody formation, and have utility for treatment of allergic diseases associated with IgE formation in mammals, such as allergic bronchial asthma, allergic rhinitis, atopic dermaties, hypersensitiveness, and the like.
    Type: Grant
    Filed: May 10, 1989
    Date of Patent: July 10, 1990
    Assignee: Kissei Pharmaceutical Co., Ltd.
    Inventors: Yoshikazu Kurashina, Hiroshi Miyata, Den-ichi Momose
  • High performance nonlinear optical media
    Patent number: 4938896
    Abstract: In one embodiment this invention provides a high performance nonlinear optical medium which comprises a transparent organic polymer film containing an array of charge asymmetric molecules such as 13,13-diamino-14,14-dicyanodiphenoquinodimethane: ##STR1##
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: July 3, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Eui W. Choe, Alan Buckley, Dagobert E. Stuetz, Anthony F. Garito
  • Nonlinear optically responsive inorganic-organic composite compositions
    Patent number: 4937017
    Abstract: This invention provides a nonlinear optical medium which is a composite of a microporous inorganic oxide glass which contains an incorporated solution of a solvent and an organic component which exhibits nonlinear optical response.In one embodiment the solution incorporated in the microporous glass monolith is composed of dioxane and 4-N,N-dimethylamino-4'-nitrostilbene.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: June 26, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Gunilla E. Gillberg-LaForce, Thomas M. Leslie, Tessie M. Che, Marie Borzo
  • Polarization-insensitive interferometric waveguide electrooptic modulator
    Patent number: 4936644
    Abstract: In one embodiment this invention provides a polarization-insensitive interferometric waveguide electrooptic modulator device. In a Mach-Zender type of waveguide geometry, each of the divergent optical paths has a set of electrodes, one of which applies a horizontal electric field and the other a vertical electrical field, respectively, to a nonlinear optically responsive polymeric medium in the optical paths. The polymer medium section between each set of electrodes has a noncentrosymmetric molecular orientation parallel to the respective electric fields.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: June 26, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Donald Raskin, Hyun-Nam Yoon
  • Waveguide electrooptic light modulator with low optical loss
    Patent number: 4936645
    Abstract: In one embodiment this invention provides a thin film waveguide electrooptic light modulator which consists of (1) a laminated assembly of a waveguiding thin film of an organic polymer which exhibits second order nonlinear optical response, and upper and lower organic polymer blend cladding layers, each of which has a lower index of refraction between about 0.002-0.02 lower than the waveguiding thin film and which exhibits second order nonlinear optical response; and (2) electrodes which are positioned to apply an electric field to the laminated assembly.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: June 26, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Hyun-Nam Yoon, Chia C. Teng
  • Process for preparing liquid crystalline polymer composites
    Patent number: 4937013
    Abstract: This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline polymer component.In one embodiment this invention provides a sole-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline polymer.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: June 26, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Alan Buckley, Tessie M. Che, Thomas M. Leslie, James B. Stamatoff, Dagobert E. Stuetz, Donald R. Ulrich
  • 4H-quinolizin-4-ones for treatment of diseases associated with immunoglobulin e-antibody formation
    Patent number: 4935425
    Abstract: This invention provides novel 4H-quinolizin-4-one compounds which exhibit a selective inhibitory activity against IgE-antibody formation, and have utility for treatment of diseases associated with IgE formation in mammals, such as allergic bronchial asthma, allergic rhinitis, atopic dermatitis, hypersensitiveness, and the like.
    Type: Grant
    Filed: November 10, 1988
    Date of Patent: June 19, 1990
    Assignee: Kissei Pharmaceutical Co., Ltd.
    Inventors: Yoshikazu Kurashina, Hiroshi Miyata, Den-ichi Momose
  • 2-pyrrolidone-5-carboxylic acid compounds useful for the treatment of mental disorders
    Patent number: 4933354
    Abstract: In one embodiment this invention provides novel 2-pyrrolidone-5-carboxylic acid compounds, and pharmaceutically acceptable salts thereof, represented by the formula: ##STR1## where n is an integer with a value of 1-4. The compounds have application in the treatment of mental disorders such as dementia and amnesis.
    Type: Grant
    Filed: August 17, 1988
    Date of Patent: June 12, 1990
    Assignee: Kissei Pharmaceutical Co., Ltd.
    Inventors: Seiichi Ikeguchi, Yukihiko Kinoshita, Hiroshi Kaneto, Yukiyoshi Ajisawa
  • Side chain liquid crystalline polymers exhibiting nonlinear optical properties
    Patent number: 4933112
    Abstract: This invention provides novel sidechain liquid crystalline polymers which exhibit nonlinear response, and which have utility as a transparent nonlinear optical component in optical light switch and light modular devices.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: June 12, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Ronald N. DeMartino, Hyun-Nam Yoon, James B. Stamatoff
  • Polyarylene sulfide resin composition
    Patent number: 4933386
    Abstract: A polyarylene sulfide resin composition, being improved in thermal resistance and mouldability, comprises (A) 100 parts by weight of a polyarylene sulfide resin, (B) 0.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: June 12, 1990
    Assignee: Polyplastics Co., Ltd.
    Inventors: Toshikatsu Nitoh, Yoshihito Tsukamoto
  • Polarization-insensitive interferometric waveguide electrooptic modulator
    Patent number: 4932738
    Abstract: In one embodiment this invention provides a polarization-insensitive interferometric waveguide electrooptic modulator device. In a Mach-Zehnder type of waveguide geometry, one of the divergent optical paths has two sets of electrodes, which apply a horizontal electric field and a vertical electric field, respectively, to a nonlinear optically responsive polymeric medium in the optical path. The polymer medium section between each set of electrodes has a noncentrosymmetric molecular orientation parallel to the respective electric fields.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: June 12, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: David R. Haas, Hyun-Nam Yoon, Chia C. Teng, Hong-Tai Man, James B. Stamatoff
  • Electrooptic device having a liquid crystalline polymer composite optical component
    Patent number: 4933111
    Abstract: This invention provides an optical medium which consists of a composite of a homogeneous inorganic oxide glass monolith with a microporous structure containing a liquid crystalline polymer component.In one embodient this invention provides a sol-gel process for producing a composite of a transparent homogeneous microporous inorganic oxide glass monolith and a liquid crystalline polymer.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: June 12, 1990
    Assignee: Hoechst Celanese Corp.
    Inventors: Alan Buckley, Tessie M. Che, Thomas M. Leslie, James B. Stamatoff, Dagobert E. Stuetz, Donald R. Ulrich